You can now update your HTC Desire Z to latest and customized Android 4.4.2 KitKat. Google recently introduced Android 4.4.2 KitKat a many Nexus models but that build is not much customized. An Aroma installer supported CyanKat custom ROM which is based on latest Android 4.4.2 KitKat is developed and shared by _MarcoMarinho_. You can download and install custom firmware CyanKat on your HTC Desire Z. Since, HTC Desire Z is capable enough to run Android 4.4.2 KitKat smoothly, CyanKat going to be a great experience for you. To learn how to flash this ROM, continue reading this guide to know how to install Android 4.4.2 KitKat based CyanKat custom ROM on HTC Desire Z.

Some of the cool Android 4.4.2 KitKat features that you will enjoy is Screen Recording, Tap to Pay (Google Wallet for everyone), NFC emulation for non nfc devices, 14% less memory usage, cloud printing from Gallery, Google Home is the new Launcher, Core System Processes Trimmed, apps are efficient and responsive on all devices, the all new 'procstats tool details' memory use, Full-screen Immersive mode, seamless change in resolution during media playback, Phone dialer got local business detection, redesigned Quickoffice and many more.

As said already, the ROM is still under development, hence you should expect some bugs in it. All bugs and issues expected to be fixed as development progress towards a better build.

CyanKat ROM Features:

Removed unnecessary files

Fixed Camera & GPS problems

Fully optimized and tweaked

RAM optimizations

Speed optimizations

Improved virtual memory management

AC!D Audio Tweaks

Build.prop tweaks

Enabled GPU UI rendering

Data, cache and system partitions mounting tweaks

Seeder Script

Improved CPU governors performance

More stable and fast

Zipalign on boot

Init.d scripts

Excellent battery life!

OpenVPN support

Improved EXT4 performance

Adrenaline Engine Tweaks

Adreno Booster

Improved the camera quality

... many more!

Warning!

This tutorial is only for HTC Desire Z. Don’t try this guide on any other Android device. Also, we (True Android Team) are not responsible for any damage caused due to the instruction given in this page. Try this at your own risk. However, it is very unlikely that your device will be damaged if you follow all the instructions as it is which are mentioned in procedure.

How to Install Android 4.4.2 KitKat based CyanKat ROM on HTC Desire Z

Connect your device to PC using USB cable and then copy downloaded files to the SD card of your device. Important: Don’t extract any files.

Disconnect USB and then turn off your HTC Desire Z.

Boot into recovery mode. To do so, press and hold Volume Down and Power button together to boot into HBOOT menu, from there select Recovery [use volume buttons to scroll and Power button to select]. Alternatively try this: Recovery Mode without Key Combination.

Perform a Nandroid backup of your existing ROM that you can restore later if this new ROM not work or you want to go back into your previous ROM. To perform a backup, select Backup and Restore, then on the next screen, select Backup again. Go back to main recovery menu after backup is complete.

Select install zip from sdcard, then select choose zip from sdcard. Now, locate the CyanKat Zip file that you copied earlier in Step 1 and select it by pressing Power button. Confirm installation by selecting Yes – Install _____.zip on the next screen. The ROM installation will begin. You will see AROMA installer screen. Follow onscreen instruction to customize your installation.

When installation is completed, go back to the main recovery menu and select reboot system now to reboot your HTC Desire Zand boot up into Android 4.4.2 KitKat ROM CyanKat.

Returning to Previous ROM: To go back to your previous ROM, boot into recovery, select backup and restore then restore your previous ROM by selecting it from the list.

Congrats! Android 4.4.2 KitKat firmware based custom ROM CyanKat is now installed and running on your HTC Desire Z. [Note: Root is turned off by default in CM ROMs, you must enable developer settings first (tap the build number 8 times under about device), then enable root under Developer Settings]. [source]